I have a ASUS Zenbook Pro UX550V with Windows 10 Pro. It has an Intel Dual Band Wireless AC8265.

The Zenbook has the possibility to connect an extrenal monitor via a HDMI plug.

When I connect and activate an external monitor (either duplicated or extended or single desktop) the internet access via WIFI is not working anymore. The WIFI signals that a good and strong internet connection exists but internet browsers (different broweser) or email clients cannot acces the internet.

In the windows event viewer there is a flood of System Errors: "Intel Dual Band Wireless-AC 8265: Has determined that the network adapter is not functioning properly. (Source: Netwtw06, Event Id: 5002)"

As soon as I decativate the external monitor the system errors stops and I can access the internet.

I made sure that I installed all Windows 10 updates as well as all driver updates.

We understand that you're having issues connecting to the internet while using HDMI to connect an external monitor.

Our main recommendation with this type of issues is to work with your computer manufacturer, as it may be hardware issue, such a defective adapter.

From our end, we can recommend making sure that your UEFI BIOS is fully updated. You may also try a clean installation of your wireless drivers:

1. Download and save our latest Intel® PROSet/Wireless Software for your adapter.2. Under Programs and Features in the Control Panel, uninstall any instance of the "Intel® PROSet/Wireless Software." When prompted, choose to "discard settings."3. Go to the Device Manager > Network Adapters > Right click on your Intel(R) Dual Band Wireless-AC 8265 and uninstall it. Make sure to select the option to "Delete the driver software for this device."4. Clear out your temporary files: Press the Windows* Key + R to open the run box. Type Cleanmgr.exe and press OK. Here you will need to make sure Temporary Files are checked, you may uncheck everything else, then press OK.5. Install the Intel® PROSet/Wireless Software that was downloaded back in step one.6. Reboot your computer.

We understand you're experiencing an issue similar to Susie242, where you're unable to use your WiFi and your HDMI port simultaneously.

- Is this a new issue, or is it possible that you never noticed before? (never used the HDMI port until recently, for example).- Have you recently upgraded or replaced any of your computer's hardware components?- Does the issue occur when you're working on battery power, while plugged in, or both?